jdk8-mips64-public/hotspot: src/share/vm/ci/ciConstantPoolCache.cpp@a61af66fc99e

     1 /*

     2  * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_ciConstantPoolCache.cpp.incl"

    28 // ciConstantPoolCache

    29 //

    30 // This class caches indexed constant pool lookups.

    32 // ------------------------------------------------------------------

    33 // ciConstantPoolCache::ciConstantPoolCache

    34 ciConstantPoolCache::ciConstantPoolCache(Arena* arena,

    35                                  int expected_size) {

    36   _elements =

    37     new (arena) GrowableArray<void*>(arena, expected_size, 0, 0);

    38   _keys = new (arena) GrowableArray<intptr_t>(arena, expected_size, 0, 0);

    39 }

    41 // ------------------------------------------------------------------

    42 // ciConstantPoolCache::get

    43 //

    44 // Get the entry at some index

    45 void* ciConstantPoolCache::get(int index) {

    46   ASSERT_IN_VM;

    47   int pos = find(index);

    48   if (pos >= _keys->length() ||

    49       _keys->at(pos) != index) {

    50     // This element is not present in the cache.

    51     return NULL;

    52   }

    53   return _elements->at(pos);

    54 }

    56 // ------------------------------------------------------------------

    57 // ciConstantPoolCache::find

    58 //

    59 // Use binary search to find the position of this index in the cache.

    60 // If there is no entry in the cache corresponding to this oop, return

    61 // the position at which the index would be inserted.

    62 int ciConstantPoolCache::find(int key) {

    63   int min = 0;

    64   int max = _keys->length()-1;

    66   while (max >= min) {

    67     int mid = (max + min) / 2;

    68     int value = _keys->at(mid);

    69     if (value < key) {

    70       min = mid + 1;

    71     } else if (value > key) {

    72       max = mid - 1;

    73     } else {

    74       return mid;

    75     }

    76   }

    77   return min;

    78 }

    80 // ------------------------------------------------------------------

    81 // ciConstantPoolCache::insert

    82 //

    83 // Insert a ciObject into the table at some index.

    84 void ciConstantPoolCache::insert(int index, void* elem) {

    85   int i;

    86   int pos = find(index);

    87   for (i = _keys->length()-1; i >= pos; i--) {

    88     _keys->at_put_grow(i+1, _keys->at(i));

    89     _elements->at_put_grow(i+1, _elements->at(i));

    90   }

    91   _keys->at_put_grow(pos, index);

    92   _elements->at_put_grow(pos, elem);

    93 }

    95 // ------------------------------------------------------------------

    96 // ciConstantPoolCache::print

    97 //

    98 // Print debugging information about the cache.

    99 void ciConstantPoolCache::print() {

   100   Unimplemented();

   101 }

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